Dental Materials and Operative Dentistry, Paulista University, Goiânia, GO, Brazil.
J Appl Oral Sci. 2013 Mar-Apr;21(2):157-62. doi: 10.1590/1678-7757201302298.
This study evaluated the effect of temperature and curing time on composite sorption and solubility.
Seventy five specimens (8×2 mm) were prepared using a commercial composite resin (ICE, SDI). Three temperatures (10°C, 25°C and 60°C) and five curing times (5 s, 10 s, 20 s, 40 s and 60 s) were evaluated. The specimens were weighed on an analytical balance three times: A: before storage (M1); B: 7 days after storage (M2); C: 7 days after storage plus 1 day of drying (M3). The storage solution consisted of 75% alcohol/25% water. Sorption and solubility were calculated using these three weights and specimen dimensions. The data were analyzed using the Kruskal-Wallis and Mann-Whitney U Tests (α=5%).
The results showed that time, temperature and their interaction influenced the sorption and solubility of the composite (p<0.05). At 60°C, the composite sorption showed an inverse relationship with the curing time (p<0.05). The composite cured for 5 s showed higher sorption for the 40 s or 60 s curing times when compared with all temperatures (p<0.05). Curing times of 20 s and 40 s showed similar sorption data for all temperatures (p>0.05). The 60°C composite temperature led to lower values of sorption for all curing times when compared with the 10°C temperature (p<0.05). The same results were found when comparing 10°C and 25°C (p<0.05), except that the 20 s and 40 s curing times behaved similarly (p>0.05). Solubility was similar at 40 s and 60 s for all temperatures (p>0.05), but was higher at 10°C than at 60°C for all curing times (p<0.05). When the composite was cured at 25°C, similar solubility values were found when comparing the 5 s and 10 s or 20 s and 40 s curing times (p>0.05).
In conclusion, higher temperatures or longer curing times led to lower sorption and solubility values for the composite tested; however, this trend was only significant in specific combinations of temperature and curing times.
本研究评估了温度和固化时间对复合吸湿性和溶解度的影响。
采用商业复合树脂（ICE，SDI）制备 75 个试件（8×2mm）。评估了三种温度（10°C、25°C 和 60°C）和五种固化时间（5s、10s、20s、40s 和 60s）。将试件在分析天平上称重三次：A：储存前（M1）；B：储存 7 天后（M2）；C：储存 7 天后加 1 天干燥（M3）。储存溶液由 75%酒精/25%水组成。通过这三个重量和试件尺寸计算吸湿性和溶解度。数据采用 Kruskal-Wallis 和 Mann-Whitney U 检验（α=5%）进行分析。
结果表明，时间、温度及其相互作用影响了复合材料的吸湿性和溶解度（p<0.05）。在 60°C 时，复合材料的吸湿性与固化时间呈反比关系（p<0.05）。与所有温度相比，5s 固化时间的复合材料对 40s 或 60s 固化时间的吸湿性更高（p<0.05）。20s 和 40s 的固化时间在所有温度下显示出相似的吸湿性数据（p>0.05）。与 10°C 温度相比，60°C 复合材料温度导致所有固化时间的吸湿性值降低（p<0.05）。在比较 10°C 和 25°C 时，发现了相同的结果（p<0.05），但 20s 和 40s 的固化时间表现相似（p>0.05）。对于所有温度，40s 和 60s 的溶解度相似（p>0.05），但对于所有固化时间，10°C 的溶解度高于 60°C（p<0.05）。当复合材料在 25°C 下固化时，在比较 5s 和 10s 或 20s 和 40s 的固化时间时，发现了相似的溶解度值（p>0.05）。
综上所述，较高的温度或较长的固化时间导致测试的复合材料的吸湿性和溶解度值降低；然而，这种趋势仅在特定的温度和固化时间组合中显著。
